
In the decades that followed, birth control became gradually accepted among other Protestants, even among the most conservative evangelicals. Primary materials on the contemporary debate indicate a wide variety of opinion on the matter. In 1930, the Lambeth Conference issued a statement permitting birth control: "Where there is a clearly felt moral obligation to limit or avoid parenthood, complete abstinence is the primary and obvious method", but if there was morally sound reasoning for avoiding abstinence, "the Conference agrees that other methods may be used, provided that this is done in the light of Christian principles". The manifestations of such movements and opinions include everything from comparatively high rates of in-group marriage being applauded and gently suggested, to more explicit calls for endogamy such as is the case with the Druze, to concerns which were expressed by Protestants in Northern Ireland about a higher birth rate amongst Catholics, to Decree 770 which was issued by Nicolae Ceaușescu's government in Romania with regard to contraception, and other population topics as part of its local variant of the North Korean ideology of Juche. Such philosophies and groups are diverse amongst themselves-being found in all segments and sectors of the political spectrum-and they usually represent, to varying extents, the diversity within their group. The former may also be a case of a manifestation of a movement of opinion within some ethnic, linguistic, religious, regional, or other identifiable groups whose members have expressed concern about their continued existence for historical or other reasons. In addition, there are those who contend that Quiverfull's "internal growth" model is a manifestation of a broader trend which is reflected in the lifestyles of such groups as Orthodox Jews (particularly Haredi and Hasidic Jews) and certain Christians including Orthodox Calvinists of the Netherlands, traditional Anabaptists (such as Old Order Amish, Old Colony Mennonites, and certain Conservative Mennonites), some traditional Methodists of the conservative holiness movement, and Laestadian Lutherans of Finland.

As birth-control methods advanced during the late 19th and early 20th centuries, many conservative Christian movements issued official statements against their use, citing their incompatibility with biblical beliefs and ideals.
